From an ethical design perspective, however, I still have a stomach ache thinking of publishing the name and image of unknowing Twitter users on an unrelated website, presenting a “like” potentially intended as a bookmark of a short tweet as a “like” for a long essay on some blog site they have never visited. Here, too, some kind of transparency/consent mechanism would be required; and while I am sorry to not have a ready solution to offer, the idea of simply warning about a backfeed in a sticky post on top of a timeline is not really something I consider sufficient. Likely, the solution for the silo backfeeds would have to come after a solution for Webmentions in general has been developed.
Just thinking about my own use, I usually use the ‘Like’ post-kind to recognise posts that I find interesting, but do not have anything to add (that would be a bookmark.) This does not mean I ‘like’ the post or agree with everything written. This is where confusion can occur.
I think this is one of those posts that I will come back to as my knowledge of webmentions and the #IndieWeb continues to grow and evolve.